Wouldn't necessarily compare Sid to Rawhide, since for example, the Nvidia drivers on Sid are still on 535, while 550 has been released and is actually very good. Rawhide is almost analogous to Gentoo's unstable releases where whatever you are getting is probably being pulled directly from the source rather than a discrete release.
Whatever the Debian team calls their releases, you can pretty much slide it back a spot or two within the chain of release freshness relative to most other distros. It's almost impossible to accurately compare the totality of packages between distros and make any reasonable conclusion, but it's pretty safe to say that with the snapshot of limited software I have looked at that is reasonably meant to be updated such as userspace graphics libraries, Debian's stance on an unstable or testing distro does not align with the colloquial definition of such a thing.
